SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a3774d669e92ae56a8000aeacdf765d37eafb20f0a6ba7b4c1e6f56bb3c929' 
  AND token = '8amlczN57lVdM3y7n1viZsPSLakZ/5TaagvkmFf2WWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

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