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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad54fd2436e0f5e1dde95649753a0447ca88fc04ef83dbed712825e2a68a003f' 
  AND token = 'NehtaRTQUWBNiKJO+3NAW9vn5PxLvwS2Zyrh9FdIcJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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