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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4877952719fa42d09f9b209ff609bbd8d9bb7ea61150d57bcd54a38efcea4b' 
  AND token = 'rnDOkRtf9asAv3JA6GdD0ZOrrFP6O4WX5AeuoRjxmJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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