SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20367d983b073c4ad5ce927fb48805c350ae9f122696530f4e20448c165d7bd7' 
  AND token = '/Ml+k5DhwsQGpaErM46q/aIpBUAetYJKhA5Id6k+G7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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