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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee3d34bf58a60e48b97ee0933cc9004334f3a943627b4d8f7b9233248b73ca0' 
  AND token = 'FomUMGyGja/ljQXBZuNiAxUy//o7zsdY98r5xVcyIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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