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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc1446db92e01a7c28aea20dde8d945ff4375be107e93495c24e05e9637d6de' 
  AND token = '2GNDfO/zAsMJM+kTnNJw+3Q7IlE0Rdomt8TvhBFLci0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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