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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865a7b1228b7a390aca446604d96a1a7b48fef1ad01cc45326186684453790e0' 
  AND token = 'rIzzM6KcymAt4L0GBebHVP7AkpS2K1Tl5Rs0KTw6qEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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