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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a696791cf741935b17f41064247b67c2521707ce00e9adbcf2fece04a14180' 
  AND token = 'sinuwIq7LJ7dzHqJR84T5ROrMKcVsrV89x8ev8EkNyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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