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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c733ebed9191456e3c77dd03ff45469ea3c86ad3b4b7667d9c1a3072ec127f' 
  AND token = 'l1A2oXFdnrGQHpoZT26Vi8EwGQDguq8NlwxZJD+l8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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