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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc939d486f5c523b7450c886acf21e45c33a3998f2c7a4c60ff3b0f258b328b' 
  AND token = '0J4hcArTed+HwGLa4tYkfPaXXMU9Nq7+vocebAAhyu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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