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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ec312735558fe36c9a17a6dc389ce38483045a554947c54a57fd94f44a6c41' 
  AND token = '2Qieqfsi2/AxkACPTk1hA7XJbRnUV5Sk7nLBQTf+S5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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