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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0880ece032995739f9093e7967b24a736e559b9718da8ed0ca50c5741a5d3c46' 
  AND token = 'H6rwX14Aue7A5cgq9j8SpuZ5Pys2XOviCl04pgDTJ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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