SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3713a380a5f53e1c0db5903334a008db654e29562c50d2e8623e62b159e6ea6d' 
  AND token = 'tOZYRqMV64CS40O/S3XisZ67jaHXBioYUI1Yj4aDOzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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