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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665e02ef6e5f4b45f3cccfe6bdbee7131c466d01f8b6b44be3c05c7a5d4e8067' 
  AND token = 'LzGRQtgqvXlfmi+Qm9dBCFTreD8HHmanrPoCxmdX0ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}