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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd015f8235d0a9ca08f523c392306408cdf0dbd10b75c807f2ab88a94e4bffc0a' 
  AND token = 'BRVdMxhrA9kLEgy5im+sXlMls10Y0tvcrAq99BufL0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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