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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090469b81e45063e866e91438ee816e6698a30613a1216079d592a81b619235d' 
  AND token = '6I7Nh7rq0qUTc8y5EqQRw8tJ83RmPDwMXZQQr1H+2vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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