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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ab0af770566de476b10e4d6f0400d9c746f129d42745ec819bcc5b8e39b190' 
  AND token = '6OIpfEDsoc7cZikmkWkXLrTpgK2hxoVaSAdNtuXDvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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