SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97fd65882ef062be0d4fc3e723d7edf0033f3f924688c626b2254cb7e5b238a' 
  AND token = 'k+HGgOhHC6J2qQhg7KmxS/FaRfVQSVHUa9n8HGnUoY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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