SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b30621dc51a14aa1ed5d3ff498b76e6b801841fdfb0a3a6fd8aaeb8e876355' 
  AND token = 'wnTnbzTl+4rFSQsx0d4rDarf86csQEzemwsExrQ3hlY=' 
  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