SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecc040fc166cdf292ec308917e53a0ad3398245694b91b3ac28e051bc0ab644' 
  AND token = 'FnwA+2e0voElknD8I7ad7UPyik1EmlbxsipOTBp18ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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