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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cade566a7c96fc19b1824a7320383db193cecd584b4f28cf8aadf1c740599fa9' 
  AND token = 'Q9WLurRVi04LCojGR7Zh798yaaSI6qjg/KVSLteuDok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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