SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0753f314d30413447c6f39ac8ae4a1290df4ed63cd58925a08a3931e0d268f5f' 
  AND token = '+vruGfjaWlZXIVhebY36buHA+YCnjMB5pS2duFJtIUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}