SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc981559311b56d2d5c360baf19dead017f969d166e4e8c90631f00a613bae5' 
  AND token = 'RoNxO8jNH8ZdMj6/8Lv5VuEnqWx8ceLW/bFHERTpR2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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