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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a914920081f8f06b731d5c609716f87c71b6bef488e72d3b8cfede7ee83c8dc' 
  AND token = '7a+HsIbbWq3G67VKWl7p0Yhq+Aw3MP8bIwyLu2yWSFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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