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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a37341ec43dadc44bd93f2769ff13a04b6602aaa9d0ea614b3c5acedb3ada8' 
  AND token = 'CDEKHHZeupj79QTYqSK+zKoR43I+YFw+suOp01t1Mbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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