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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8661d8bc91e5c59a991895bbbe333d6331fe4cb8fe42b26f3d5c17573198029a' 
  AND token = '8gsUYMm/Sv3KBtMTOk04LxHc7gK8jaqORejlg7yTTX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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