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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893b5b9cc1471177e72a2eee29cf4e305ad98469e411fbe8155c62fa72924b87' 
  AND token = 'eMSGXLPz/5QIRyvjD4EFVjnbYuATK6A4HozeofPlQgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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