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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a6183980454b5e74ea33741df3f69a612cb4f853d2d406e0fc901e9f545e71' 
  AND token = 'ncu1sg0IbO8bbHzMYp/SeQvFu7VCK6PnPiXJdhLkp8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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