SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4896ce9f8bf4809edfa65ad2ee504218bb324ac0128b2c44cd3d242d7e587359' 
  AND token = 'ljfI30T93E7JgzCV0SBihHCrqNO3zSryc1H5t0n/pcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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