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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f65f110e45b42e1b436545419a77c98694e767a058df96d26f6a5139d054eac' 
  AND token = '7uqAmrPx/GELCdaO9KcTvH7eSlhmKKFl7P5A3g8t3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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