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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08437888ee598896b5536c5aca3d1e4848144ffa6531d0678c049ce5cb4ae72' 
  AND token = 'SjOyQDXnAxz1Oy0Ph6sFHfXrEClq0zJw2o8aiczKCTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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