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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d415e1501ab8c9e6fc0a613621f1d328bed876ad18994577a3d3a7662c1c298' 
  AND token = 'vv7ZiM/2Io2nwu2sh/MLETfdenxGRld0L4c3sJURIvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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