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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2838953170967d827c54026d91dca2dc49a7596a425c56c6316d04ef11a4201c' 
  AND token = 'oZHOUGfSqKZj3rIQMawaAv3MmFoG8FPN9zazuUvAzSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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