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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b898d86b9ab529c7613d9fd6326d65f78916006167d265a4314da953f810ea4' 
  AND token = 'YHQqtv33iNVmyvyM1h6SwiDjcsbAdSZDpY9e27z8wVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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