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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d633828303020ca850f7d6aff5195989badede310cdfe25d791e74d492995e' 
  AND token = 'sBimqaclcQCn0eWSBoJ26YPVID+BGPaWyxDN3MDVil8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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