SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1267d98c54f0428ee6099353f05ca09d47bb41d711f428fda285289712709a35' 
  AND token = 'SOabTq/IIUQwn2kwS0acsrYusgMYvFZ1LeOf0n7FyUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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