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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5407550693e078acf2492ad2087df5603dbc8cd2f5d4cf25a8e0900199f9b032' 
  AND token = 'tObjcXbCFE7Lw90vP/BOZqogM3HH7Pj+W9v++6GAyoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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