SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897211940e84c58313cec218b8fb73475d66b96c4ef340d4b66bebff3a4fccc3' 
  AND token = 'h6L8AvGzuTdbz6i4ktmic009bRpa/QbNKebZG5yezMI=' 
  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