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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd0d8ec31d7444339a457b10dfe8b752507e895c0a37315cb49366f406dd0db' 
  AND token = 'rzM4sY4v+tSya/afjFHvWaLO4vpQ8xoWC+xRnl3Ywq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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