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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2f13173b6fec2efb3cb4cb8071ca1cf97503a627a9767fc311a85210dd5c8a' 
  AND token = '9OrBu8tRUBa6oZQI+MSCT+Xu99AqxCIMgR9R6V79n6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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