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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0196cf76c02fca98aa38d73aa573d26a8834cc28ecf16fb65fefac447862fd3e' 
  AND token = '1RyWRIgwXwpEQWxhjOF9UxYLkhv37+MyzUmDmgza6yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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