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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68918ad626de635c9ce090d3fb28bdd5058dd205d2d99163c7cfa8d4b580c9d9' 
  AND token = 'hIcB3aSqWfkdEJw549xYjFLvau0oHQivysuMciJ41Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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