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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5103b929a13eb1593968a3b0c92b6d634e198228df820090c0a441f35907237' 
  AND token = 'CQa8XIKHU8N0OWRaArqIJ1ydZoQmA9+SQ7mZs6uDA5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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