SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69381dded1fbe4aabe83ce915ac86603aadcf2357bca796af0b8907d990b5373' 
  AND token = '54aHxtO87cwpy5gVrPZRHR7qcEdvSAkPc9HEKYql/Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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