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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99eea4b7ca08c206138009fe03d540ed3daf5cb5ace9fa788f252781d46b682' 
  AND token = 'GYM8vBsUHs/xQndKF/j0Z6/72EC86jteifDgnv2jZTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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