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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4a7be62dabb38bf41acd1f0ee8e43c01a54f8dc117e36b14cffe170f5a1dbc' 
  AND token = '4lg/zXayBGF4rs16bALfSQg+w/81bZtwTw6VEoG/qz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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