SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfef7ff7d88e07a678b02f33f3d6eec9346f8bbd3a6c260716186a77ed99e6c' 
  AND token = 'nobHEFyPXMG+ZnJcEsOhP0FJNaKlsSZK8NGlBJth1Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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