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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db799559abe12f85a6b3531b50dca55b5440c52f3ac3578a65e19aa5b19e58a8' 
  AND token = 'WPUP+V6mbFoLmOxbm1L7alx4z2aZ3O4aHE3vnprLI1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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