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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7974789e048746ce5495af9553a57d84550ff9e64003ba5afa3b9725cb8a9f' 
  AND token = 'zOUtqvkYuL2yaQzOWZNABpIfjlXCQu2tZfVlYoCPI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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