SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe2f4d2eb13a1cd40283ac14594df69d261f938979ec4e2f2fd506fd751e4b0' 
  AND token = 'CdW9mubyP0RPp80qdmy76AvIsekY6CwqeXMR+RV79z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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