SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7ad09071a18fe6aea38ea588ea465b2ef7c3b98625d9e8a538fe99be4c3e7a' 
  AND token = 'Ye/K0GrKZRTRDFVTFUJvzJxxvIpZNZOZkUstwAC6X8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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