SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2695fcc2b96d463f475e0dba558065956007c3eb91926a9839ed3ed6729f0a' 
  AND token = 'gKQBsF17qiQHLK36bZie2bBT+VQGo1860nJryB96zvM=' 
  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