SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31faf86da3c05d88f5629a2056c01bc753a3b8df261bc9ea842cebac3813579' 
  AND token = 'tnX/Z0CJvsmN8hDUdo8+J/26y4qly/6HZ9MRBlWPwz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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