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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a95b798d2fee2a6af048b1ac5253a4e87fe4bf6e85fff3d97c615aa6363d5a' 
  AND token = '2Qo2+/Z7WtuFL1T7iCiPaWCn8W2KD8jf1T3hDVvvywg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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