SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04a5096436a81d2fbdcc61e9c19a2c654f1b655c2b6403c7425d527d01bf55e' 
  AND token = 'y1UqsA1bAYUSJatyQEA6Q8vYNVM3LYgZ+wQQtpfaTfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables