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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8d6221328edd67b3029709cf5e450887fb43e049be59157fcc06240e34e38' 
  AND token = 'yaHThHsA7ZZQtinovsP+6g8Y1G8mlmfNyCoWqN+diHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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