SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02bac4257b7c465d1b90d7c050f7a7f2c5d0ba49926d7c637062c66df7a3e63f' 
  AND token = 'i49RxRUPbNChXPouLrvpS1n/tbytb1mBJcLQKwlyu+Y=' 
  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