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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db25b3f3da2785e02b7e21a4bbe56e3f14892ae8ea86cbfb5b595eff4419773d' 
  AND token = 'nWZT6qmvnKtf69H+m5eqM8HlX5WA+m7bswbhGJUHzUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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