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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f3246794d068519b989e5a65427d084de01ab01b659a7e07830dd5eda5b323' 
  AND token = 'De5ChQr4FsD6/1CgD0IJHqdFlB1lkrxmP2VKylGLTT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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