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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d399c8728323f1395ba6a2d11feb5c14996394c566c32067080722aa20caaab' 
  AND token = 'YoTVzPX8CHDeyc1T86mnhj/9X01QjckvNLWmp4YD5O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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