SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cc45850e9f73f815e07e22cc628f4160e12347eeb9ee657c08440f54d4f80e' 
  AND token = 'ksVabcriSPhBF+DBDISmgzMJ7cqGXkt3lIUuKEfrQ6Y=' 
  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