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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806835a0d5f046deab8284c8446a3179cf4fc02c8d59028b6c82605e19981c4f' 
  AND token = 'C5utptEa3H4MWtD+q6dL4HRL438nwJttMgmRx/lJSys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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