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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027d1be1ff0a26076961db3621a6022fa61ebb2554064a45de5f6116386a4e8f' 
  AND token = 'Qy5ul1LImuqGXmTkM+IryeTMIbQ/ruV3zG972Ar5LE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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