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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3896dce2ea72225a9b772930693600bb0d2d865dc4fac539d38d900b9236e2' 
  AND token = '2qHuInu7rOsIzlyekf0kYIUal3o9UazPcC8oG+sxTDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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