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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb2e16d9c416749c9e81a39d8012d7f9dd6a3ccd0dcd830acc2746d5447e33d' 
  AND token = 't9XDQMIN9TgU+h6GAjNZxZ7/o8hwgHoiYVCLiST8YzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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