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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43031c9e099fc60a14f565a524589bc5dccab98137816503fb01ce52af5aec6' 
  AND token = 'C3cAsFxq1lBoz3Gj6/tWV5lMvGKN+/iVuVlOUApf6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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