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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8d4841df15352b8592d54aa0ba3b1fd3418d2ab3c9981a54b5613693cd1a06' 
  AND token = 'ej9LwUY7qwHMa/Ng11QJrydA+5O1zHtwGo7HeO8q3r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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