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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d3b9a6a10b64294d7b8c99a6d2353e592bb30b53a91a7b5726860a3c7ffe51' 
  AND token = 'dkwz1iWCgmaQaPAcXB7GXQE7uUm35f8ziLkt0kJQMYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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