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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f7d33ba5f609cb28b49946703f46694b48b2124bdcccf1c03ae17d86982c5d' 
  AND token = 'PH57dPZDcu7jO994qKme7Rdm+2sS7WpPJg5SWQEgFrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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