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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d087d3031e52dd52cdd46204a2c05fda9a5f8d767c6c5211d2434462fcf8d9' 
  AND token = '8hIHFwHGtr0KD1Szw86T/cQnYu3AvyJCkKs8U4ncy30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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