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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e07a5675a637d84e7f532fd1dbe5bd88d2896d88ffd08c9134706d8456a166b' 
  AND token = 'Nl6FSjgeGFMyleB86Fb2EwhGuGXWDvByn5Etf42W7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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