SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa856ada082f0cc3acd37354611df2e7bbddd6baa6604076ccdecac1e1f94fcb' 
  AND token = 'KJrLgrAmXMibEAnb8tNs1XKDQGCRR7VpRG6sgAsaF7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

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