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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8b84d9d565be01716014147258b3947b54e77ff512ac148744b1fa098b0907' 
  AND token = 'roMa0OJp0Ep3FfoViKYllNrnMQLHLhChYbCz+Do7mH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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