SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c0cd58c8e0abead589be361a957b530e8ce333b9110ac69d02dd095fc5c87f' 
  AND token = 'kyV5ZXOb4RSsb+zV100pSfQUOZF4kD0kJWKq4AtMUd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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