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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b8fb5b551ed439808ac80ea0d73dec8e5d4492d7c6192305ef973999de463f' 
  AND token = 'RwWExSeBNVfWUEfy57/pLTKQeYC0zoweTr7dhJzQHJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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