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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005f0a6181e6df94aea7bb62382c112827a5cc656b196789820ffc097104234f' 
  AND token = '5S3ia7n2Av4n35VWTTE9teNA9CpkD22bi7mtGdIGJec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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