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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9d8e18d828058d72cfd44155adefe228b27156bac7f5de3ccb0b7a0f29855f' 
  AND token = 'XOdnpnsZZxQx1p95j8Co+QQHyctY8ORXibo2YTfUl14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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