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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15495734406768fb681f04b219554ff161fbac152fad89adb65ca057a60c2703' 
  AND token = '5740A7bCNUGJD+BKQQ+7qg4U84B9NDJZ/WesNnAy9+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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